[1] Pore fluid pressure plays an important role in the frictional strength and stability of tectonic faults. We report on laboratory measurements of porosity changes associated with transient increases in shear velocity during frictional sliding within simulated finegrained quartz fault gouge (d50 = 127 mm). Experiments were conducted in a novel true triaxial pressure vessel using the double-di...

Sapphire dies (of single-crystal aluminum oxide) are used to obtain interfacial conditions along the contact surface of the die in a strip-drawing operation. Several solutions based on slip-line field analysis and upper-bound techniques are available for metal-forming problems. However, these solutions generally neglect elasticity and work-hardening and assume that friction is constant along th...

Metallic nanowires usually exhibit ultrahigh strength but low tensile ductility owing to their limited strain hardening capability. Here we study the unique strain hardening behavior of the five-fold twinned Ag nanowires by nanomechanical testing and atomistic modeling. In situ tensile tests within a scanning electron microscope revealed strong strain hardening behavior of the five-fold twinned...

In order to improve the wear resistance of ductile iron, different contents TiC particles are added into iron used lost-foam casting and tribological behavior is studied through a ball-on-disk sliding test. It found that with increase content, pearlite content gradually increases, which attributed promoting heterogeneous nucleation cementite increasing cooling rate melt. The second-phase streng...

Two of the most popular vibration testing methods for nonlinear structures are control-based continuation and phase-locked-loop testing. In this paper, they directly compared on same benchmark system, first time, to demonstrate their general capabilities discuss practical implementation aspects. The considered which is specifically designed study, a slightly arched beam clamped at both ends via...

In the production of critical parts for various machines and mechanisms, expensive structural steels are used alloyed with chromium, nickel, molybdenum, vanadium. practice, wear resistance parts, especially under severe operating conditions, may be insufficient due to uneven microstructure content retained austenite. Therefore, increasing operational stability products made alloy is an importan...

1967 Price 8s 6d net .-summary The time hardening, life fraction and strain hardening hypotheses variously proposed to describe tiniaxisl creep deformation are considered and compared with experimental evidence. It is concluded that the strain hardening hypothesis is the most nearly correct, the experimental strains usually being within 50% of those predicted. Further, rheological and modified ...

Replacing high-strength frictional materials with lightweight composite alternatives is currently a global challenge for researchers. In this work, aluminum alloy (AA2900)-based metal-matrix composites reinforced 6 wt.% α-alumina were fabricated then subjected to T6 heat treatment followed by case hardening. The resulting samples exhibited improved hardness, strength behavior, and stress–strain...